Hoist drum



y 6, 197. J. H. MAUDE 2,420,050

HOIST DRUM Filed March 21. 1945 7 Sheets-Sheet 1 I 4 I 1 I I nab m; 6 5R\SER gmg'rs ROPE GROOVE M5 6- HERE 0 5 STARTS HERE ATO i3 AT (0N STA NTLEAD v FILLER Mm m? wiDTH HERE \fl I AT 0 J a7 as 1 8 ii b 31 1%- I Q i4- FACE OF RlSER MACHINED i 3 AS ROPE GROOVESWITH 5A HEAD; NVENTOR FACE0F F\LER MACHlN ED J.H.MAUDE wn'u sAME LEAD As ROPE sRoovzs.

ATTORNEY May 6, 1947.

J. H. MAUDE HOIST DRUM Filed March 21, 1945 7 Sheets-Sheet 2 RISERSTARTS HE E INVENTOR J.H-MAUDE WMM JM ATTORNEYS J. H. MAUDE May 6, 1947.

HOI ST DRUM 7 Sheets-Sheet 5 Filed March 21, 1945 MACHINE 8 HANDDRESSRADIUS 1; Lane EQUAL TO ABOUT /8 XROPE DIA.

MACH l NED WITH SAME LEAD AS ROPE GROOVE S F o m D m e m w w R D u do E4 K 20.5% $6 M 4 5 m 4. gm zfl uzo u W U 9 A 6 w 6 i TmwA E H M. II. P

maowmzo I L WW. @1423 H .A F N E 2 1| p M w H L L I A m T A P6 H L o zI. In H F E CM... W F W h L P F H KL 5 m PM E M E (0 m n .\A \Z 7 j Km 6THiS FACE MACHINED W\TH SAME LEAD-AS ROPE -GROOVE$ EAD=PITCH=SLIGHTLYGREATER THAN R ALL D lMENSlONS MARKED \NVENTOR J.H.MAUDE ATTORNEYS ay 6,1947. J. H. MAUDE 1 ,4

HOIST DRUM Filed March 21, 1945 7 Sheets-Sheet 4 TURNTURN TURN W14 FIBilb

90 WITH our msER \NVENTOR v J-H-MAUDE ,J. H. MAUDE HOIST DRUM May 6,1947.

Filed March 21 1945 7 Sfieets-Sheet 5 E70 wm-| OUT FILLER 870W|TH FILLERFIG. 13

INVENTOR r J-H-MAUD E W144i:

ATTORNEYS Patented May 6, 1947 UNITED STATES PATENT OFFICE HOIST DRUMJohn H. Maude, Montreal, Quebec, Canada, as- .signor to DominionEngineering Works Limited, Lachine, Quebec, Canada Application March'21, 1945, Serial No. 583,913

3 Claims. (01. 242-117) This invention relates to improvements in themanufacture of hoist drums and has particular reference to hoist drumsused in mining operat'ions.

Hoist ropes used in mine hoists are often 4000 to 5000 feet long. Singlelayer winding of these long ropes on the hoist drums would require drumsof excessive width and, since themaximum permissible fleet angle fromthe drum to the head sheaves is usually limited to 1 the hoist would belocated too far back from the mine shaft. For these reasons the ropesare usually helically wound on the drum in two or three layers.

In order to prevent damage to the hoist rope during the multiple layerhelical winding thereof, it has been proposed to provide the hoist drumwith separately formed filler and riser elements, the filler elementbeing attached to the drum flange at the same end of the drum as therope anchorage and the riser element being attached to the drum flangeat the end of the drumre'mote from the rope anchorage. The purpose ofthe filler is to fill up the space that would otherwise be left betweenthe first helical anchorturn of the first layer of rope and the adjacentdrum flange and to thereby prevent the last turn of the second reverselywound layer of rope being pinched between the first turn of the firstlayer and said flange. The purpose of the riser is to gradually lift thelast turn of the first layer of rope out of the drum rope grooves to asufiicient height above the cylindrical surface of the drum so that thisturn becomes the first turn of the second reverscly wound layer of rope.In the absence of the riser the last turn of the first layer is crowdedoff the drum by the next preceding turn which, during rotation of thedrum in a rope winding direction, approaches closer and closer on thehelical angle to the adjacent drum flange, thus leaving less. and lessroom for the last'turn which is thus subjected to pinching and excessivewear.

The fillers and risers heretofore employed have consisted of separatelyformed elements machined to the required shape from bar stock andsecured to the drum flanges by welding or screw fastenings. It has notheretofore been feasible to design these filler and riser elements sothat they will cover mor than 200 of the drum circumference. In thisconnection it may be explained that the filler is formed so that, in itsap plied position, its circumferential surface is concentric with butprojects beyond the grooved c'ircumferential surface of the drum. Theinner face of the filler which is perpendicular to the cylinz- 2 dricalsurface of the drum is machined to present a helical surface having thesame lead as the helical rope grooves of the drum. In order tocompletely fill the space left between the first or anchor turn of thefirst layer of rope and the ad- ,jacent drum flange, the filler shouldextend around the entire circumference of the drum but, in making thefiller from separate bar stock, there are practical limits which preventthe fiile'rbeing designed so that it will cover more than 200 of thedrum circumference. In this connection it will be readily understoodthat if the "separately formed filler was machined from bar stool; toextend around the complete circumference of the drum, the thinnerportions of the filler would be of such reduced section that it would bedifiicult, if not impossible, to securely anchor these thin portions ofthe filler to the flange or spider of the drum by either welding orfastening screws. Moreover, the machining "from bar stock of a properlydesigned 'fil-ler capable of extending around the entire circumferenceof the presents serious machining difficulties. It may also be pointedout that welding of the filler element to the drum flanges is notfeasible in the case of drums equipped with iron flanges but requiresthe'use of steel flanges. In the case of iron drum ilanges the use of"fastening screws mdst be resorted to and if the separately formed lineris designed to extend around the entire circumference of the drum, thethin portions of the filler have not suflic'ient section to permit themtobe secured in place by fastening screws. As 'a man ter of fact, evenwhen the separately formed 'fi1l= ers are designed in accordance withconventional practice to cover not more than 200 of the oncumf'erence ofthe drum, the thinner portions thereof cannot be securely fastened inplace by fastening screws with the result that the filler is oftensheared ofi in service and damages the ropes so seriously as to requireits immediate replacement. Moreover, a filler which covers notmoreth'a'n 200 of the circumference of the drum presents an appreciableshoulder effect at the thin end which is objectionable. The same remarksapply in the case "of riser elements formed and applied to drum hoistsin accordance with conventional practice.

The present invention provides a drum q pped with filler and riserelements which extend around the entire circumference of the drum andare produced by simplified machining procedure capable of beingconveniently and satis factorily performed by a lathe or boring mill.

5 This invention makes possible the formation of filler and riserelements which are proportioned and shaped to give a more correct ropeaction without danger of pinching or crowding than can be obtained bythe best procedures heretofore available.

The invention will be more readily understood from the followingdetailed description of the accompanying drawings, in which- Fig. 1 isan end view of a hoist drum equipped with filler and riser elementsproduced in accordance with my invention.

Fig. 2 is an elevational view of the drum shown in Fig. 1.

Fig. 3 is a sectional view alongthe section line 3-3 of Fig. 2 andincludes legends and other data relevant to the formation of the fillerelement shown therein.

Fig. 4 is a sectional view along the section line 4-4 of Fig. 2 andincludes legends and other data relative to the formation of the riserelement shown therein.

Fig. 5 is an enlarged detail view with legends and other relevant dataof that portion of the drum which is enclosed by the circle X shown inFig. 2.

Fig. 6 is an enlarged detail view with legends and other relevant dataof that portion of the 'drum' which is bounded by the circle X shown inFig. 2.

Figs. 7 to inclusive are diagrams illustrating the manner in which thefiller and riser elements ensure correct rope action without danger ofpinching or crowding. These views also illustrate the section contourand action of the filler and riser elements at selected points aroundthe circumference of the drum.

Fig. 16 is a view illustrating the incorrect rope action, pinching andcrowding which occurs in the absence of the riser element.

- Fig. 17 illustrates the incorrect rope action, pinching and crowdingwhich occur-s in the absence of the filler element.

Fig. 18 is a view showing the manner in which the component parts of thedrum are preferably formed and assembled. I

Fig. 19 is a view similar to Fig. 18, but showing the filler and riserelements as they appear in their original cast condition prior to beingmachined to the required diameter and finished shape indicated by dottedlines.

Figs. 20 and 21 are view-s similar to Figs. 18 and 19 but showing amodified arrangement in which the filler and riser elements are machinedfrom the parent metal of the drum shell.

Referring more particularly to the drawings, 5 designates a hoist drumincluding a cylindrical rope winding portion 6, end flanges 1 and 8,drum supporting spiders 9 and lo, a filler element ll and a riserelement l2. These elements may be formed as integral parts of a. singlecasting but are preferably fabricated and assembled as illustrated inFigs. 18 and 19. As here shown the cylindrical portion 6 comprises ahollow tubular member having its ends fitted on and welded or otherwisesecured to cylindrical portions 911 and 10a of the spiders 9 and I0which are formed as separate castings. The flange 1 and filler elementII are cast integral with spider 9 and the flange 8 and riser element l2are cast integral with spider ID. The filler element II and riserelement l2 are initially cast to the shape shown in Fig. 19 and,together with the other component parts of the drum assembly, aremachined to the finished, shape shown in the preceding figures by 4 thespecific machining procedure hereinafter described.

The filler element ll extends around the entire circumference ofcylindrical portion 6 at the inner side of flange I. This filler ismachined from the parent metal shown in Fig. 19 so that it presentsa'eircumferential surface I la which projects beyond but is concentricwith the circumferential surface of the cylindrical portion 6. The facellb of filler II is machined to the same helix as the helical ropegroove l4 (shown as left hand helix) which begins adjacent the minimumwidth portion of the filler (located at the point indicated by 0 inFigs. 1 and 2), extends around the cylindrical portion 6 toward theflange- 8, and terminates a predetermined distance short of thebeginning of the lifting surface of the riser l2 as will be clear fromsubsequent discussion of the contour of said riser l2. The face I lb ofthe filler (compare Figs. 2 and 7 to 15 inclusive) varies from zero toone pitch in 360 and, as clearly'indicated in Figs. 2 and 7, the minimumwidth of the filler is at zero and equals about times rope diameter. Therope groove l4 startsat 0 (Figs. 1 and 7) with constant lead andsuitable pitch characteristics such, for example, as those indicated bythe applied legends in Fig. 5. The face I lb of filler ll istransversely curved on the same radius as the rope groove l4.

A portion of the hoist rope which is wound around the grooved surface ofthe drum is indicated at l5. The anchor end (not shown) of this rope ispassed through a rope anchorage opening l? formed in the cylindricalportion 6 and the spider 9 and is anchored to said spider in the usualmanner such, for example, as by means of the rope anchor plate l8 shownin Figs. 1 and 3. The rope anchorage opening I1 is located at thebeginning of the starting portion of the rope groove l4 immediatelyadjacent the minimum width portion of the filler l l, as shown toadvantage in Fig. 2.

The rope riser I2 is eccentrically machined from the parent metal shownin Fig. 19 as indicated by dotted lines so that it presents a ropelifting surface l2a which is eccentric to the cylindrical surface of thecylindrical portion 6 and extends around the entire circumference ofsaid portion 6. The rope lifting surface l2a begins at the 0 pointindicated in Fig. 4 and proceeds around the cylindrical portion 6 in thedirection indicated by the arrow Z. From the beginning or 0 pointindicated in Fig. 4 the rope lifting surface l2a gradually rises abovethe cylindrical surface of the drum portion 6 until it reaches, at 180,a predetermined maximum elevation (see Fig. 11) suflicient to lift thelast turn A of the first layer of the rope out of the drum groove [4 toa sufficient height above the cylindrical surface of the portion 6 sothat this turn A becomes the first turn B of the second layer of thereversely wound turns which are wound on top of the first layer. Fromits point of maximum elevation at 180 the elevation of the rope liftingsurface lZa of the riser gradually diminishes to zero at the aforesaidstarting or 0 point. The face In of the riser is machined to the samehelix as the rope groove l4 so that it varies from one pitch to zero in360. The action of this riser as regards lifting the rope smoothlywithout pinching or crowding will be readily apparent from a study ofthe showing in Figs. 7 to 15 inclusive.

Fig. 16 shows the incorrect rope action and pinching which occurs in theabsence of the riser as-the final turn of the first layer of rope iswound around the drum to form the first turn of the second layer.

Fig. 17 shows the incorrect rope action and pinching which occurs in theabsence of the filler element. In this view the last turn of the secondlayer of rope is shown pinched between the first turn of the first layerand the adjacent drum flange.

In producing the hoist drum described herein the end castings affordingthe spiders 9 and H), the flanges and 8, and the filler and riserelements H and I2 are roughly machined to approximately the shape shownin Fig. 19 and then assembled with the tubular rope Winding portion 6.All concentric diameters, including the face Ila of the filler H, arethen finished in the lathe or boring mill with the drum properlycentered. The drum is then offset to enable the first offset diameter(see Fig. 4) of the riser surface In to be turned about the offsetcenter C. When this turning operation is completed the drum is againoffset in the opposite direction to permit the second offset diameter(also indicated in Fig. 4) of the face I211 of the riser to be turnedabout the center C. Following these offset turning operations the drumis again centered to enable the groove 14 and the helical faces [lb and12b of the filler element II and riser element 12 to be machined totheir finished contours. In this connection it will be noted that theterminal portions of the groove M are machined from the same parentmetal as the riser II and filler l2. The helical faces of the filler andriser elements are machined by successive machining operations in thecourse of which the drum is appropriately tilted with respect to theline of travel of the cutting tool.

Instead of being machined from the parent metal of the drum flanges 9and 10, the filler and riser elements I l and I2 may be machined fromthe parent metal of the shell portion of the drum as indicated in Figs.20 and 21. In both cases substantially the same machining procedure isfollowed.

Having thus described what I now conceive to be the preferred embodimentof my invention it will be understood that various modifications may beresorted to within the scope and spirit of the invention as defined bythe appended claims.

I claim:

1. A hoist drum comprising a tubular body portion, a radially projectingflange at one end of the body portion provided with an integralprojection extending entirely around the inner side thereof and forminga filler element adapted to fill the space between the flange and thefirst turn of the first layer of rope helically wound around the bodyportion from a starting point adjacent said flange, said fillerpresenting an annular circumferential face concentric with butprojecting a predetermined distance beyond the circumferential surfaceof the body portion and a helical inner side face which projectsradially from the circumferential surface of the body portion and variesfrom zero to one pitch in 360, a second flange located at the oppositeend of the body portion and provided with an integral projectionextending around the inner side thereof and forming a riser elementadapted to gradually lift the last turn of the first layer of rope as itis wound helically around the drum to form the first turn of the secondlayer which is helically wound around the drum in the reverse directionon top of the turns of the first layer, said riser element presenting aneccentric outer circumferential rope-lifting face which graduallyincreases from zero elevation to a predetermined maximum elevation abovethe circumferential surface of the tubular portion of the drum at 180and then gradually decreases to zero elevation at approximately 360 anda helical inner side face which varies from one pitch to zero in 360 andhas the same lead as the helical inner side face of the filler element.

2. A hoist drum equipped with a rope-lifting riser formed integral Withand extending entirely around the inner side of one of the drum flanges,said riser element presenting an eccentric circumferentially extendingrope-lifting face which varies from zero elevation above thecircumference of the rope-winding shell of the drum to a maximumelevation above said rope-winding surface at 180 and then graduallydecreases in elevation to its starting point, said riser element alsopresenting a helical inner side face varying from one pitch to zero in360.

3. A hoist drum equipped with a rope-lifting riser element formedintegral with the shell portion of the drum and extending entirelyaround said shell portion immediately adjacent the inner side of one ofthe drum flanges, said riser element presenting an eccentriccircumferentially extending rope-lifting face which varies from zeroelevation above the circumference of the rope winding shell surface ofthe drum to a maximum elevation above said surface at 180 and thengradually decreases in elevation to its starting point, said riserelement also presenting a helical inner side face varying from one pitchto zero in 360.

JOHN H. MAUDE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,984,604 Stahl Dec. 18, 19341,913,508 Phillips June 13, 1933 1,444,002 Mossberg Feb. 6, 19231,245,231 Horton Nov. 6, 1917 810,490 Knupp Jan. 23, 1906 1,924,216Smith et a1 Aug. 29, 1933

